I’m having memories of Cleve Backster...
I’ve believed since childhood that trees do communicate with each other, root and branch touching root and branch; endless lines of communication.
Trees do communicate. Squirrels are the enemy of pine trees in that large squirrel populations eat most of the seeds that pines need to reproduce. Pine trees have evolved a method to deal with squirrels - namely starvation. Periodically all the pine trees in a forest will not produce cones causing a massive crop failure and a precipitous drop in the squirrel population. It’s thought that the trees synchronize the timing of this is root grafts that occur naturally when pines are in close proximity.